Jinn (Arabic: Ø§ÙØ¬Ùââ, al-jinn), also romanized as djinn or anglicized as genies (with the more broad meaning of spirits), are supernatural creatures in early Arabian and later Islamic mythology and theology. An individual member of the jinn is known as a jinni, djinni, or genie (Ø§ÙØ¬ÙÙ, al-jinnÄ«). They are mentioned frequently in the Quran (the 72nd sura is titled SÅ«rat al-Jinn) and other Islamic texts.
Once you tighten up and lose range of motion in your arms, it reduces stride length, which is difficult to get back without burning a lot of energy. While sprinting, it is important to get a full range of motion with the arms. Remember, speed is a product of stride length and stride frequency. Stride length and frequency are determined, in part, by the motion of the arms. If you are lazy or passive with your arm action, you are limiting your potential for speed.
Although the core and upper body muscles are involved in sprinting, itâs the collection of lower body muscles that drive against the ground by explosively extending your hip, knee and ankle joints that propel your body forward.ip extension, or when you forcefully drive your leg backward, is performed by contraction of the gluteus maximus and hamstrings. Your gluteus maximus is the largest and strongest muscle in your body. It originates at your pelvic bone and then fans down and out, where it then inserts at the top of your femur bone.